Legal settlement liability - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2020	Dec. 31, 2021
Loss Contingencies [Line Items]
Loss contingency, lawsuit filing date			February 13, 2018
Upfront payment			$ 2,000
Royalty payment duration			10 years
Mile stone payment			$ 6,000
Common stock, shares issued	134,601,671		134,601,671			133,749,663
Cost of sales related to royalty expense		$ 700	$ 800	$ 1,400
Interest expense	$ 647	433	1,237	808
Interest Expenses Related to Litigation Settlement	500	$ 400	1,000	$ 800
Legal settlement liability, current	2,139		2,139			$ 1,463
Settlement Liabilities [Member]
Loss Contingencies [Line Items]
Legal settlement liability, current	$ 16,800		$ 16,800			$ 15,200
Common Stock [Member]
Loss Contingencies [Line Items]
Common stock, shares issued					2,087,545
BD [Member]
Loss Contingencies [Line Items]
Stock issued during period shares new issues					2,087,545